声像图伪像是指超声显示的断层图像与其相应解剖断面图像之间存在的差异。它表现在回声信息

阅读下列资料，然后回答问题：

人工血管是以尼龙、涤纶、聚四氟乙烯（PTFE ）等合成材料人工制造的血管代用品，适用于全身各处的血管转流术。人工血管的制造，近年来绝大多数是采取医用高分子材料进行编织。我国在50年代末60年代初才开始进行研究。起初是用尼龙织成，后因尼龙降解，在身体内植入后发生破裂而被淘汰。现在多采用涤纶纤维编织人工血管，已大量应用于临床，如治疗主动脉狭窄，上下腔静脉切除更换术等，最长可达37cm。目前用高分子材料由机器编织的人工血管，平织的内径最小为8mm，针织的内径为3mm，再小就比较困难了，但针织人工血管目前在国内尚未能正式生产。此外，还有膨体聚四氟乙烯纤维材料织成的人工血管，内径可达6mm。最近国外报道用弹性聚氨酯制成的人工血管，管壁无孔隙，内壁光滑，可随血压改变而伸缩，内径能达到4mm，此种材料制成的人工血管是很有前途的。此外，还有人研究用化学方法处理的人脐静脉、牛颈动脉作为人工血管等等。

（1）下列有关人工血管的叙述错误的是________。

A．材料一般为合成材料  B．是人体血管的代用品

C．适用于全身各处的血管转流术  D．具有人体血管的全部功能

（2）目前编织人工血管多采用的材料是_______。

A．尼龙  B．聚氨酯  C．涤纶  D．聚四氟乙烯

（3）目前临床应用的工人血管的长度最长为_______。

A．37cm  B．8mm  C．6mm  D．4mm

（4）就目前的技术而言，能否产生替代毛细血管的人工血管？原因是什么？

阅读理解。

     The global energy crisis is approaching. What can we do? Here are some steps you can take.

     Cooling puts the greatest stress on your summer energy bill and the power grid (电网). Just as a tune-up

for your car can improve your gas mileage, a yearly tune-up your heating and cooling system can improve

efficiency and comfort. Clean or replace filters monthly or as needed.

     For central air conditioning systems and room sir conditioners, look for the ENERGY STAR, the federal

government's symbol for energy efficiency. For central air, purchase the system with the highest possible

Seasonal Energy Efficiency Ratio (SEER).

     Use energy-efficient ceiling fans either alone or with air conditioning Ceiling fans do a great job of

circulating air. When used with air conditioning, fans allow you to raise the thermostat (恒温器) and cut

costs. Ceiling fans cool people, not rooms, so before you leave, turn off the ceiling fan.

     Let a programmable thermostat "remember for you" to automatically adjust the indoor climate with your

daily and weekend patterns to reduce cooling bills by up to 10 percent. You can come home to a comfortable

house without wasting energy and cresting pollution all day while you are at work.

     Try to make your home airtight enough to increase your comfort, make your home quieter and cleaner

and reduce your cooling costs up to 20 percent.

     Cut your air conditioning load, and reduce pollution by planting leafy trees around your home and fixing

reflective bricks on your roof.

     Close blinds or shades on south-and west-facing windows during the day, or fix shading equipment to

avoid beat build-up.

     Turn off everything not in use: lights, TVs, computers. And use fluorescent bulbs (荧光灯), which provide

bright, warm light while using at least two-thirds less energy, producing 70 percent Jess beat and lasting up

to 10 times longer than incandescent bulbs (白炽灯).

     Drive the car that gets better gas mileage whenever possible if you own more than one vehicle. If you

drive 12,500 miles a year, switching 10 percent of your trips from a car that gets 20 miles per gallon to one

that gets 30 mpg will save you more than $65 per year.

     Carpool. The average U.S. commutes (乘车上班族) could save about $260 a year by sharing cars twice

a week with two other people in a car that gets 20.1 mpg-assuming the three passengers share the cost of gas.

1. According to the passage, the thermostat is used to _____.

A. make rooms quieter

B. control room temperature

C. turn off the air conditioner

D. reduce room air pollution

2. We can conclude from the passage that the author probably discourages _____.

A. planting leafy trees around your home

B. turning off the ceiling fan before you leave your house

C. keeping your south-facing windows open during the day

D. using fluorescent bulbs instead of incandescent bulbs

3. According to the passage, you can save fuel by _____. 

A. using energy-efficient ceiling fans

B. sharing cars with others on workdays

C. turning off everything not in use

D. reducing 10% of your car trips every year

4. This passage is mainly about _____.

A. energy-saving tips

B. fuel-saving tips

C. do it yourself tips

D. environment-protecting

54岁女患，劳动中突感头晕，随即左半身无力，右眼闭合不全，双眼向左侧凝视，10分钟后昏迷、高热、双瞳孔小、四肢软瘫，应考虑的诊断是（）。

A.小脑出血

B.脑桥出血

C.基底节区出血

D.中脑出血

E.脑叶出血

Delta Mare公司总经理收到各部门下一年度资本投资的项目申请，他决定按各项目净现值由高到低进行选择，以分配可用的资金。这种决策行为被称为（）。

A.净现值决策

B.收益率决策

C.软性资本预算

D.硬性资本预算

《船上油污应急计划》中的操作性溢油是指（）。

A.舱柜溢油

B.管道漏油

C.船壳漏油

D.A、B、C都是